#include<iostream>
using namespace std;
int fib[]={0,1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,6765,10946,17711,28657,46368,75025,121393,196418,317811,514229,832040,1346269,2178309,3524578,5702887,9227465,14930352,24157817,39088169,63245986,102334155,165580141,267914296,433494437,701408733,1134903170,1836311903};
int main()
{
	int n;
	cin>>n;
	int cnt=0;
	for(int i=1;i<=n;i+=5)
		if(fib[i]%2==0)
			cnt++;
	cout<<cnt;
    return 0;
}
